## Electronics Forum: ax-501 long board (Page 1 of 126)

### How long for NPI?

Electronics Forum | Tue Jul 21 17:06:55 EDT 1998 | Jerry

I have some general questions about new product introduction: 1. How much capacity on the average is committed (line shifts) are committed by your factory to NPI? ie. We commit one line on 8 hour shift per day to NPI. 2. How many NPI's would you com

### How long to burn in a circuit board

Electronics Forum | Fri Feb 11 10:37:54 EST 2000 | Leslie Hall

I'm trying to find out what is considered a standard or what other companies are doing to test their cuircuit boards. Is everyone using a envirmental room if so what is the ramp up and how long do you test it? Thanks

### Re: How long to burn in a circuit board

Electronics Forum | Fri Feb 18 09:12:13 EST 2000 | Leslie Hall

Thanks Dave F for you 2 cents. You bring up some important points that what one person is doing isn't neccesary right for us. Someone might burn in their boards for 10 hours in temperature but their ramp time is only an hour versus someone else is

### Re: How long to burn in a circuit board

Electronics Forum | Mon Feb 14 12:07:47 EST 2000 | Dave F

Leslie: Product screens and tests of prototypes and test vehicles should be tailored for the specific goal and product. I caution your use of equations and test condition information without specific use environments and design conditions. Lawyer:

### How long can you leave paste?

Electronics Forum | Fri Mar 16 07:10:53 EDT 2007 | davef

1 Print paste on a bare board or laminate. 2 Place components in the paste. 3 Gently invert and support the board above a table. 4 At one hour intervals, record the number of components that have fallen from the board.

### How long can you leave paste?

Electronics Forum | Mon Mar 19 12:25:11 EDT 2007 | slthomas

This test nicely demonstrates the bond between parts and paste over time, but what about tack of paste on unpopulated boards? It seems she would also need to be testing by placing parts on boards that have been printed for 15 minutes, 30, 1 hour, 2

### Re: Soldering long lead thru hole parts

Electronics Forum | Thu Dec 09 23:57:41 EST 1999 | Jeff Sanchez

Mike, A drag solder system is not so bad. If it's not discoloring the silk screen , damaging your parts or blistering your boards than it looks like a safe bet. I am not sure what other components you have on the boards besides the LED's? But the

### Soldering long lead thru hole parts

Electronics Forum | Thu Dec 09 13:37:35 EST 1999 | Mike F

Does anyone have a suggestion for soldering boards with 1 inch long leads sticking out the bottom? Our vendor is using a drag solder machine, but I'm not happy with the preheat and controls on it. We assemble boards with numerous LED's( 200 to 700 pe

### How long can you leave paste?

Electronics Forum | Fri Mar 16 02:20:09 EDT 2007 | Wayne

Have to check with paste manufacturer. paste on the stencil should be at least 12 hours paste on the board before mounting should be at least 4 hours.

### How long can you leave paste?

Electronics Forum | Mon Mar 19 14:24:30 EDT 2007 | jdengler

I have been involved with the evaluation of close to a dozen pastes from 5 manufactures. I never found one that would rest on a board for anything close to 24 hrs and still have acceptable performance. Jerry

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